| Longtan | |
| Official Name: | Longtan District |
| Settlement Type: | District |
| Seat Type: | Capital |
| Subdivision Type: | Country |
| Subdivision Name: | Taiwan |
| Subdivision Type1: | Municipality |
| Subdivision Name1: | Taoyuan |
| Leader Title: | Mayor |
| Leader Name: | Yu-tsai, Deng |
| Area Total Km2: | 75.2341 |
| Population Total: | 125324 |
| Population As Of: | February 2023 |
| Population Density Km2: | auto |
| Pushpin Map Caption: | Location in the Republic of China |
| Coordinates: | 24.8444°N 121.2053°W |
Longtan District is a rural district in southern Taoyuan City, Taiwan. Longtan is home to the headquarters of the Republic of China Army.
The township is known for the Buddhist temple in the center of Longtan Lake and the large Bainien community project. The area is surrounded by high-tech industries and mountains.
Longtan is home to a number of military bases, and a few research installations. National Chung-Shan Institute of Science and Technology and Institute of Nuclear Energy Research[1] are two of the more well known ones.
Longtan used to be a rural township of the former Taoyuan County. On 25 December 2014, it was upgraded into a district of Taoyuan City.
Huangtang, Yongxing, Zhongshan, Wushulin, Wulin, Bonian, Lingyun, Longxiang, Bade, Shengde, Shanglin, Longtan, Longxing, Zhongzheng, Shanghua, Jiulong, Wuhan, Tungxing, Zhongxing, Beixing, Jiaan, Sankeng, Daping, Sanlin, Jianlin, Fulin, Gaoping, Gaoyuan, Sanhe and Sanshui Village.
The district is part of Taoyuan City Constituency V electoral district for Legislative Yuan.
Longtan is served by National Highway No. 3.